31190945 has 8 divisors (see below), whose sum is σ = 37593960. Its totient is φ = 24842880.

The previous prime is 31190933. The next prime is 31190981. The reversal of 31190945 is 54909113.

It can be written as a sum of positive squares in 4 ways, for example, as 20647936 + 10543009 = 4544^2 + 3247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31190945 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12476 + ... + 14765.

It is an arithmetic number, because the mean of its divisors is an integer number (4699245).

Almost surely, 2^31190945 is an apocalyptic number.

It is an amenable number.

31190945 is a deficient number, since it is larger than the sum of its proper divisors (6403015).

31190945 is a wasteful number, since it uses less digits than its factorization.

31190945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27475.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 31190945 is about 5584.8854061655. The cubic root of 31190945 is about 314.7817249915.

The spelling of 31190945 in words is "thirty-one million, one hundred ninety thousand, nine hundred forty-five".